Shop Now for Transition Boxes. Macomb Marine Parts handles an array of aftermarket boat repair parts such as Piranha Propellers, SEI Sterndrives and Webasto products as well as original equipment marine repair parts by MerCruiser, OMC, Volvo Penta, Crusader, Pleasurecraft Marine, Chrysler, Chris Craft, Quick Silver, and many others. Shop Now for Great Deals on Transition Boxes! For more information about a specific Transition Box or another product please email us!